We use a pro­cess­ing sketch
that takes a svg file and draws on the path infor­ma­tion given by this file.
We define the para­me­ters to exe­cute the pro­cess­ing sketch as
usual.

ren­der­ing

The chmod+x logo was sep­a­rated into
lay­ers.
The pro­cess­ing sketch now runs on every file (=layer) in the direc­tory.
The out­put file­names are unique for each file (=layer) so they can be eas­ily
sorted and rearranged later on. The pro­cess­ing script is called inside a for–loop,
the input file­names are writ­ten into a
textfile which is read by pro­cess­ing.

lay­out­ing (=overlaying)

Layouting/Overlaying of pdf-files is done with LaTeX.
Because some of the LaTeX code needs to be gen­er­ated by a script any­way,
I decided to let the script write the whole tex file. Most of the LaTeX code is sta­tic, only a small sec­tion is writ­ten each time,
because there need dif­fer­ent graphic files to be ref­er­enced. This is done with a for–loop.

for PDF in`cat$PDFS|sort|sed's/99_//'`doecho"\put(0,0){\graphic{"$PDF"}}">>$TEMPTEXdone